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Anaximander ancient animals appeared astronomers barometer Biela's comet bisexual bodies botany cells century charts Chinese civilization comet compilation contained course cross-fertilization crossing Cuvier degree disease doctrine earth Egyptian Eocene Eratosthenes ethics evolution fact force fossil fossil remains G. P. Putnam's Sons Hipparchus history of paleontology horse Hygiene interest knots knowledge Lamarck latitude light log-book longitude magnet marine means meteor system meteors method molecules morality nature negative pole non-sexual November number of hours observations ocean organs origin ovary ovules parthenogenesis pass period petrifactions physical plants present probably produce Professor Ptolemy published Pytheas question races radiant matter radiant point sail says seen self-fertilization sexual reproduction sheets of Form shells ship species Spencer square stadia stay-sail Strabo supposed theory tion top-sails track tube volume W. K. Clifford wind